tracking that for us, in some really heated testimony today, cnn's jim acosta. jim? lay out the information for us. what's being said? what is the controversy? >> reporter: well, chris, you're absolutely right, lawmakers on capitol hill are trying to get to the bottom of what was known about the older suspect who is now dead, tamerlan tsarnaev, and this trip ta hat he took to rusa last year. law makes want to know why is it that tamerlan tsarnaev was able to make this trip in the first place. should he have been stopped before he went overseas? when overseas what did he do? what was he up to when he was over there? some of this is stemming from some of the conflicting stories, quite frankly, chris, from federal officials over tamerlan tsarnaev's status. senator lindsey graham, republican from south carolina, told reporters yesterday that tamerlan was on a no-fly list, that he was on some sort of terror watch list a federal law enforcement official has told cnn that is not the case. and senator charles grassley, graham's republican colleague in the senate, asked secre